\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{CCES Experiment of OLS Models of Confidence in Attribution, v2}
\begin{tabular}{l*{5}{c}}
\hline\hline
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}\\
                    &\multicolumn{1}{c}{Base}&\multicolumn{1}{c}{Controls}&\multicolumn{1}{c}{Democrats}&\multicolumn{1}{c}{Independents}&\multicolumn{1}{c}{Republicans}\\
\hline
Supportive Endorsement&       1.524\sym{***}&       1.717\sym{***}&       1.936\sym{***}&       2.229\sym{**} &       1.419\sym{***}\\
                    &      (5.41)         &      (6.30)         &      (4.63)         &      (2.80)         &      (3.71)         \\
[1em]
Independent Endorsement&       0.318         &      0.0868         &      -0.349         &       1.002         &       0.228         \\
                    &      (1.06)         &      (0.30)         &     (-0.76)         &      (0.99)         &      (0.59)         \\
[1em]
Supportive Endorsement $\times$ Independent Endorsement&    0.000668         &     -0.0935         &       0.730         &      -1.291         &      -0.704         \\
                    &      (0.00)         &     (-0.23)         &      (1.15)         &     (-0.97)         &     (-1.28)         \\
[1em]
College             &                     &      0.0634         &     -0.0790         &       0.607         &      0.0196         \\
                    &                     &      (0.30)         &     (-0.25)         &      (0.86)         &      (0.07)         \\
[1em]
Age in Years        &                     &      0.0229\sym{***}&     0.00937         &      0.0711\sym{**} &      0.0291\sym{**} \\
                    &                     &      (3.44)         &      (0.92)         &      (3.48)         &      (3.08)         \\
[1em]
White               &                     &      -0.357         &      -0.285         &      -0.985         &       0.251         \\
                    &                     &     (-1.35)         &     (-0.78)         &     (-1.34)         &      (0.52)         \\
[1em]
Perception of Iranian Threat&                     &      0.0181\sym{**} &      0.0309\sym{**} &   -0.000729         &     0.00795         \\
                    &                     &      (2.88)         &      (3.10)         &     (-0.04)         &      (0.93)         \\
[1em]
Female              &                     &       0.154         &      -0.168         &       1.568\sym{*}  &       0.153         \\
                    &                     &      (0.74)         &     (-0.52)         &      (2.40)         &      (0.53)         \\
[1em]
vulnerablepower     &                     &     -0.0471         &      -0.175         &      0.0717         &     -0.0247         \\
                    &                     &     (-0.50)         &     (-1.15)         &      (0.25)         &     (-0.20)         \\
[1em]
Democrat=1          &                     &      -0.958\sym{**} &                     &                     &                     \\
                    &                     &     (-2.95)         &                     &                     &                     \\
[1em]
Republican=1        &                     &       1.100\sym{**} &                     &                     &                     \\
                    &                     &      (3.27)         &                     &                     &                     \\
[1em]
Constant            &       5.346\sym{***}&       4.574\sym{***}&       4.770\sym{***}&       1.250         &       4.983\sym{***}\\
                    &     (26.69)         &      (9.37)         &      (7.16)         &      (1.03)         &      (6.90)         \\
\hline
Observations        &         597         &         490         &         234         &          61         &         195         \\
\hline\hline
\multicolumn{6}{l}{\footnotesize \textit{t} statistics in parentheses}\\
\multicolumn{6}{l}{\footnotesize \sym{*} \(p<0.05\), \sym{**} \(p<0.01\), \sym{***} \(p<0.001\)}\\
\end{tabular}
\end{table}
